One's a fake-tanned, drunk-driving sister of Spencer Pratt.

The other a world-renowned pop star and gossip staple.

Both look fab in flowing, similarly-patterned dresses! But there can be only one winner of THG's celebrity fashion showdowns, so who will it be this week?

Stephanie Pratt went shopping in L.A. in her French Connection dress, while Britney Spears hit the stores Down Under in a blue version of the same thing.

Who rocked it best? You tell us by voting below!

Who looked better in their frock?